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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa2791836d97e5ae8ba899fccd938bddedad35da8d23d0360b4f11d31ac080ee' 
  AND token = 'VkvL7V5ONCzfgRfnWQor+XbxuZjsjS8hA7VFecK1CyE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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