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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd60b4b3b5707d73087f4feb1cd8116e27920a2b2c24643032c0efdf16dd247b0' 
  AND token = 'scfS8kP4R3wi+PKuFURTdZ0dd+VW8aA47/TTHi0LDcc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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