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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '35076b1a4f639a8b7e0fd18c611176c258eeb5c8c96f99135ba92daca1f2552e' 
  AND token = 'CUcGb/S4CZ09jwCY8l4Qj4FG063Eg5OZ/sY8dLfnRAI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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