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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '821b05638c0e4093d82a045c5a4d420af947b000314c72f8453c65266fe225dc' 
  AND token = 'y2yeqpKE69Ta2jOl1eKWQZv58ba+Ux6u2cNYpUFvetY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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