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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a824fa8a425ed89f11d365f2170d638987392359914d77cba7f31b0f6d0704d9' 
  AND token = '90WwwrRszB8yhAIg2Yq74W1E3gr5eB6JxfPoQthabws=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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