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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e2d40d884b0abb11a9e4106841856ec6fdceb1c166616236fd12bba921620ad1' 
  AND token = 'qKAfH1kTKsFaAT5cPCps/qolyMxWtZCP07ljsAhTymA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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