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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a4a3aff2657bb9f9c38c26d88f928b05d2a50af801b1b0f7432da5e4e365187' 
  AND token = '60Y5DWPiF+UmCl08Rg0mSsbjDpbAuLA+RdImpOyge9g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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