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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc059580ef7bc4067e79826e0e97768f88db0c1b33a14d8f87032db5998fd6f9' 
  AND token = 'lJs6FJiMHt2o0+GXpu406q+H8TDtc4zzauyEESWG/sY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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