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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '559bcd755c878dd3abe2deecfee33c847af1aea24c0982a7e729119c00bed3e7' 
  AND token = 'QjcvCpQSz61gybHbsbshyLeRWUedhF3Fug6gXgzN2mE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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