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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b6795eae80905b48e6675239da89979e384bb2fade3685f45227b4d6a622984' 
  AND token = 'uuk5ma5zG3IF0+jAlRjeFP/5atyufjcgXCeXocxAu/E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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