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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'baabffd16924784c949775ccccd4376fca973ec39ab95a2384440d43a78024e8' 
  AND token = '6RC7sER56DMYAYPmKWgDHmqgAsi5Ub8L3OcKQW1KdhQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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