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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '872c22ef6683bc0863ae7badf3a62c253000e6a50dea04bad1e1f768a47564a3' 
  AND token = '8raOGkb3ybUtVApi4wP+xl5xJZ4nMRVdLZ9V2Lb57SA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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