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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ea451f2a2b3800ce4df37b3b13e2382100b05a368a3d990ba50f6eae6ab76a3' 
  AND token = 'WYTvsxRWwE5/3sjumKCGQbsfpYto1547MSv6BP00U7I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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