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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6993e33970e54e2e7aec3046b8f1540db8f46cfe9f8edef661a795824c4829e2' 
  AND token = 'QsbKzSX6NjYB25LEW9Gr0sBlsS3YMNO2QF/dfqOVpsw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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