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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0ef1ec7937e0d68a2da88e2bad9f0b757b90dda16b044eedc9a25524dcf2a19' 
  AND token = '3Ea/BlglNZXqngRu+C+EyINI88lyCOA0BIuGtYICI8s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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