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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb2fa41a26ab8a90a6abd9e0f1e1657b7634177fb2cff75745291b920397144c' 
  AND token = 'mIYzi37n70g9u8OnJf6Zd5YNdo6ZWCv/s+iIUI9t/7c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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