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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31d11360635d21d04f73f56245e6d4e6547dc655378b0251c672bd6af05f950f' 
  AND token = 'mhCsoH4ObZAHC81DXPOmb10QLvPxjIn51ZUf/xGP5Sg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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