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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29383adc77155fc1889ea100338322594271c8ef3f7da067402fe183187ecf8b' 
  AND token = 'yDXrQGsj1Vm6MfBrcHXUKdp4y9H0bwwQQ06/SgDSt6Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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