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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36b6c47dfe7864dd9964cb59e2fca824117c264d137e084f37523449465aeeff' 
  AND token = 'Y+LQkHqSKxu1df1bhBBi5PG4XP3Ra3tLOO8ECru/rQs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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