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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9667fa1b930acb5f9bef088f924ebcb1c94929f35795066a3159bf0af4fb42d0' 
  AND token = '1pMNmDLXclvYzTpgKwik1N2Km1TE7j+uKe76pwQEnbY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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