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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9a0f0971ee13895ce4e0f3a4545859fe6ec839ef55c0c4ca341d9b09ff3800e' 
  AND token = 'Vk1OMIqppCR3DKdLSNEXIhegP8kbVLYb3W1nO1e8CLY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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