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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '749b11135651b62a4980a9d6f079247b34217e06a710230e98bf25969b82ab55' 
  AND token = 'jHO14OzjvDIL7oWgDnYf3pporpztRUP2CqORemHzWaI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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