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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f73d5b82183f46227c7846aed8e10db0c97861a34a90d6684accbd52129523ea' 
  AND token = 'ro2tCepEwzzSA+pjlaZr6TIkikeZhxPpDMpHxVqzfiE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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