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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe07fd845500eb5bd0ade5c398d8cabd6a3695c5080c09f88fce3b222717647a' 
  AND token = '2Cz1mrp4YmFxueRNFY/g+2KukgxKU2mIZZIk8VmLpOM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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