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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a8d9e7d2391472716f20fc557dd374a375d617ba1bb6cebe836b9f9c9d242482' 
  AND token = '2IfSy5qa8VZ8rsRmQEmM6CRR3oAtnZFqXGl231isWYM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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