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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db4e9d573ba280eb2e8581463965719a5227493cf80486722bd052dc8a030763' 
  AND token = 'umBPahJE6BS5cJAIVQWwllalky9i8mJZGCHnkAv8tL8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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