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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0c9f28646a9b492b4296e7adede7957343e6aa87e88c054068a71e1b63225cc' 
  AND token = '/+qMGi/C6gTLofowgoP54NEGlg56u/AV5hB0fX6nFd0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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