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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db883d1337ead500df19ff385f38630559b0d00d8bf61352fc8446ccf0ce1a67' 
  AND token = '8gnTssasvml4qleJov52l51C4Z3GPuBcK/vtNnkEJss=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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