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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ba089daa1c1f1883f4d86405f4a8c3cb0f09ae992fe7bc80d4d11bba7d0a317' 
  AND token = '0erW5JUse15iH+VWcrSS8+rXSlJ4MQC4yBgbKu2/HCk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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