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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c47661d3f6387c1266fbca9f6e7397d1ec90d6cf28b1fcd1c0bcded91b60235' 
  AND token = 'hZFMikuVrWB8HP9KNSqgCA4iZsUiQqsev/eGlLQb6lQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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