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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6363233e9a14eb790dfe5fcd68dcdd30b400a1056d12d9a7907b1937018a7fd0' 
  AND token = 'X64dD1OwdxpidHrVnGSfghadYO7qW3jdutO0zD9bt1o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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