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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55eeddc912f9e270a00ce05a038ee07c4c2140ad99e8f5daa397b0052c1f6f2f' 
  AND token = 'wUke4ysjGeJXCpseQQu5O9uAevq0KTjUc5pKiZraOvc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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