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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4150f3684e40f4f2872db7bf0b0d2aab15c355c1d6bb0c94ccb0332f66a3fb3a' 
  AND token = 'Rm9ST6h5ejwPm0RHHqJ/HaanJsuaJEiNQ/Q0GcWKGzQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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