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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4af54e0621af41f01a807cd715a71140cea1370f41b44da23ae0a546d40ccecb' 
  AND token = 'lybXw0AJK8Jk+fSCxByrwZef3Sd61mKd8a5q2FZzHpA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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