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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd31762a2a414a11740ca4b544a779c2f775649f67ce473e4d2098f419e121a4e' 
  AND token = 'o3qvQ1hUghPa7Vrrat4x/K0zQo+OcbpruDmgNzdGc4k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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