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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a25ddc0a186c21d2adf3a3b60caa44169aabae8aaf23d70ab6505b7035c03011' 
  AND token = '+PufibzDjrZP8+Pq5c0NK43SG3jZrNTduz/Kyzmns7E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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