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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '840813270bd2d888ca7e758c1bf9820c4a086b5ec8e1dfbba87531f0d8cc46da' 
  AND token = 'lTqjlFs12HhrLv55g4Pt7L1QN7TBfEJturS2qPyBW8I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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