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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '18a98989fa56704832faf1e921ba42b6c27bd5ec256b382af2cd37a9e1a998af' 
  AND token = 'QHb+d+1t4kai9oX7Cp7LIuTx8GGQ5TLl+s/Bvi1q/OQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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