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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef3d60fb6e2de009cbb57df41e3e91df6bc6adc6253988863adb77c6413f15c0' 
  AND token = 'FAoFFqnLQ5iIIY5h9SxaZJ5ZK4n9tWKS/N3HFkZSEVM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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