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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bcf4f22d421b780f6e5905fa7389e34e11489edae6299a14d558fd0378814dea' 
  AND token = 'OxA0EpAFaqzUCGDeA9fCLhgExXM1nntzi3npNMH+dlU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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