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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd13f5427dae315a6319fc8860df8cf1e0e40f31fcf92831c1a80e3437399776' 
  AND token = 'vuL4zz+kjMolUToVec4j1c+AejuHb9KnmRu5sju+c2Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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