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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c0a39931cf15dbe878e09949d553d3b933c5258d415bbfd226bee0a8ff48ea1' 
  AND token = 'eoK21hP7seUipONIm2jCw9l7tSCwUjBmNK7HYFv40F8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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