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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6538072bb30c5263a14b1cd8c024dc9cd8ae43962d59976325e2aeafa26f8eb3' 
  AND token = 'v98boA0WV2iiPZKofCaUys4SijG2zdBhq3gB7biXD6I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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