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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '25f08788393fb26ee64893fac78f2cc3c0a8c65cb4a246226027dd55cf16ba68' 
  AND token = 'rH+63aQAA5gjpV0Qi/yj/br0rbxSKiTvomnHnBlp8eI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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