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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94a7ac4e40cd88cdbfa0b02ee4e11afe2bf26083bc44e33977f6405bef1cd5e7' 
  AND token = 'A19Vd5S93E2oN1az9jnrSyuokWy/B5iAAaYoMqWvmZI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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