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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb1064681085624e8c9d6801d191a169ef3a056d7c426ad5010393f508ef990c' 
  AND token = '0QIPySgvQfpw/A3jQr4JBhFEiyYQ8pa9ouROc/b/tZg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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