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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf816b6877b10293ea1ae9b2126295dc60fffb0009034275aa428eeb74a11869' 
  AND token = 'WKR3w38bV7EmEOXAHyD13wP1LQiZ5op/w/Islfro/oQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}