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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6128a747a577287a528984f7404e00b04c0f7e4cc50f45a704a8d4163c3ba58' 
  AND token = 'e+PgLn/DVp9/+XGfLNKIJAgp8dHPSmSIS3fRpprmb7E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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