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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa45371c5e547ca1812e1e981ede5d42a2ef6120e9b12514a642ef3f50015e68' 
  AND token = 'EdNIJRlVejrLtFWuX0EMA3k5r0t5Gh319UlFpVKbSl0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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