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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b87f595d4b15207ef038183c50d30084d60bddcfc5dacef1cf4761862b7f391' 
  AND token = 'zAJDQdS4Ohe/ydtefFEWWWEQPuaG4Zkoa+TnVLm8Ko0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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