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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '943d9b38ceb114b1a93e1277da0df3172a263ca51cf5bf466516d3bd1ff03323' 
  AND token = 'kZttGyFBO+SQ90z6poLpF99m7qoZEhqf30TEpPnejLI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00090

JSON explain

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