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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5a6a693108947c68e6a3e924e58d331d3d1b3e01c58838427e43e4104ffc7a2' 
  AND token = 'l1AlcOyRBkokQaNlvXZI/ip4CPEAq1QHguceiBoQBN0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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