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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0387089244d7512d5d4a11d42bf93e7ba2be8c6fd8106789b99f1cb98b3f0b84' 
  AND token = 'xWDv4vHknSrRW36imawI8/K6OjiKC8HhPE5eiX1R658=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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