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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '970723438aec832758a142233e2dd2d120ede93711ac47a155bbed73b0845589' 
  AND token = 'ez2r4ajA+9I9Kh1nByKfZGQebp8u6EBchXJ3mh7kE6M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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