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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe8822201a3e17cc6ea44428c9b0998419d06594c06d3f7217dbcdcbef3c52bb' 
  AND token = 'jRD4RwipLDtv064ZEym0ADDRUKJuzJ/FNsS3P7ZBw3s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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