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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e32bcd574218e76c259404ad819811220043da00455200028b657fdec41f920' 
  AND token = 'aP2pNwXWBjt/42c0niVAUnRDT2GSYlb9Tmg0/O7jL6g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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