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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04ef6db2d436078fcb31a1cadba5a819937f892cb354a969d1f45db6fde5a712' 
  AND token = 'SiRhRwX8MZ/305edABeXqBEvF+sqhql6e7UuOjevdxs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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