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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2c1d89c9d819b9d4c5c8781daa09f151ca10145dd289f76d52bb7998a7d10d60' 
  AND token = '5oZAxAr0i0XjR7Q/Urf0lpan6Vs72UTAuR96tnzgHm8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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